Abstract

Abstract Infrared spectra of H 8 -(ET) 4 Hg 3 I 8 and analogous salt with deuterated ET molecule D 8 -(ET) 4 Hg 3 I 8 are studied. Polarized reflectance spectra from single crystals and absorption spectra of powders are measured as a function of temperature. The influence of semiconductor-semiconductor phase transitions on IR spectra is considered. It is observed that the v 27 (b 1u ) mode of ET molecule couples with electrons.

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